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UW CSE 190p Section

UW CSE 190p Section. 6/21, Summer 2012 Dun-Yu Hsiao. Now it’s time to team up and code!. Find a partner and make sure that you have at least one laptop. Try to share what you think with your teammate!.

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UW CSE 190p Section

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  1. UW CSE 190p Section 6/21, Summer 2012 Dun-Yu Hsiao

  2. Now it’s time to team up and code! • Find a partner and make sure that you have at least one laptop. • Try to share what you think with your teammate!

  3. Today’s material will also be covered in the following lectures with more details, so don’t worry if you feel confused. • When in doubt, you can always stop me and ask!

  4. Continue from Michael’s lecture…

  5. A program is a recipe

  6. What is a program? • A program is a sequence of instructions • The computer executes one after the other, as if they had been typed to the interpreter x = 1 y = 2 x + y print x + y print "The sum of", x, "and", y, "is", x+y

  7. IDLE • Now try to change x = 3, y = 4 and make print the result out again. • Any better way rather than type everything all over again? • Use the editor • Be sure to save as .py to have code highlights

  8. Exercise: Print a table • Create a table using print about the simpleinfo of your team. • The required variable fields are: First name, Last name, Month of birth in number, and Favorite color. • Your code should start with: first_name = “Bill” last_name = “Howe” ... • Example output: "Bill Howe, 1, likes green""Dun-Yu Hsiao, 5, likes red"

  9. Exercise: Print a table Careful about the conversion between number and string Use str(some number)

  10. Exercise: Convert temperatures • Testing your program • Making a temperature conversion chart • Chart the conversion of 5F, 32F, 104F, 212F, 293F • Print out example: 5F -15.0C ... • (Tedious, isn’t it?) • You can create a Python program!

  11. Loops: basics • Use loop to reduce code repetition! • For loop: for iterating_var in sequence: statements(s) for x in [ 10, 2, 43]: print( x ) • List list1 = ["a", "b", "c", "d"] list2 = [1, 2, 3, 4, 5 ] list3 = ['phys', 'chem', 1997, 2000]

  12. Exercise: Convert temperatures Now try it using one for loop! Much more concise!

  13. Exercise: Create a log table using loop • Numbers: 1, 2, 4, 8, 10, 20, 40, 80, 100, 200, 400, 800, 1000 • Import - To not reinvent the wheel! - Use the console to check usage quickly!

  14. Careful! • Don’t forget colon • Careful about the indentation

  15. Start Using Command Lines • Command Prompt in Windows • Terminal in Mac/Linux

  16. Command Line Basics • Show current directory/folder • pwd (on unix, linux, osx) • echo %cd% (on windows) • List contents in the current directory/folder • ls (on unix, linux, osx) • dir (mostly only on windows) • / on unix, linux, osx • \ on windows

  17. Change directory • cd Use “tab” to loop through path! • Make directory • mkdir(on unix, linux, osx) • md (on windows)

  18. Exercise • Go to your desktop directory • In Desktop, create directories in this structure: • Desktop • test_dir1 • test_sub_dir1-1 • Test_sub_dir1-2 • test_dir2 • Test_sub_dir2-1

  19. Now go into test_sub_dir_1-2 • Copy and save the commands you used in the report. • Now go into test_sub_dir_2-1 • Copy and save the commands you used in the report.

  20. Invoking Python from the command line • python myprogram.py • python myprogram.py argument1argument2 • The operating system command shell is not the same as the Python interpreter

  21. Today’s takeaway • IDLE • Print • Loop • List • Import

  22. Questions?

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